I finally found a solution for CUA hair to be auto loaded & parented in place for models, from here on now they will be included as clothing and you guys won't need to make any extra preset by yourself, using Stopper's CUAClothing i was able to make it work so everytime you load the model into new scenes it would automatically load & stay parented without lag even with appearence preset! (demo test in GIF above).
I also found the problem in DAZ that was causing the crosseyed issue as many of you pointed out, turns out the "auto adjust rigging" feature was not working consistently across different models, making the eyeball control bones off-center. i'll manually adjust them so this shouldn't be a problem for now on & update the previous models with this fix soon. see both pictures above for example of right& wrong bone center location (small RGB cross in the center of the eye)